Merging r182266:
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r182266 | rnk | 2013-05-20 07:02:37 -0700 (Mon, 20 May 2013) | 13 lines

Implement __declspec(selectany) under -fms-extensions

selectany only applies to externally visible global variables.  It has
the effect of making the data weak_odr.

The MSDN docs suggest that unused definitions can only be dropped at
linktime, so Clang uses weak instead of linkonce.  MSVC optimizes away
references to constant selectany data, so it must assume that there is
only one definition, hence weak_odr.

Reviewers: espindola

Differential Revision: http://llvm-reviews.chandlerc.com/D814
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_33@182337 91177308-0d34-0410-b5e6-96231b3b80d8
Merging r181487:
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r181487 | fjahanian | 2013-05-08 16:38:56 -0700 (Wed, 08 May 2013) | 4 lines

put noisy "unknown command tag name"  warning
under -Wdocumentation-unknown-command and off by default.
patch by Dmitri Gribenko.

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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_33@182338 91177308-0d34-0410-b5e6-96231b3b80d8
Merging r181342:
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r181342 | rsmith | 2013-05-07 12:32:56 -0700 (Tue, 07 May 2013) | 4 lines

C++1y: Update __cplusplus to temporary value 201305L to allow detection of provisional C++1y support.
Add __has_feature and __has_extension checks for C++1y features (based on the provisional names from
the C++ features study group), and update documentation to match.

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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_33@182340 91177308-0d34-0410-b5e6-96231b3b80d8
Merging r181283:
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r181283 | rsmith | 2013-05-06 19:55:48 -0700 (Mon, 06 May 2013) | 6 lines

C++ status:
 - fix paper links to point to isocpp.org, where most of the papers are already up
 - update "SVN" features to "Clang 3.3" to distinguish them from features which we
   complete after the branch
 - document use of -std=c++1y to enable c++1y support

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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_33@182341 91177308-0d34-0410-b5e6-96231b3b80d8